PAP system blower

1. A blower, comprising:

a housing including an inlet and an outlet,

wherein the inlet and the outlet are co-axially aligned;

a bearing-housing structure provided to the housing and configured to rotatably support a rotor;

a motor provided to the bearing-housing structure, the motor including at least a stator assembly; and

an impeller provided to the rotor,

wherein the bearing-housing structure includes a bearing shaft having an exterior surface and an interior bearing surface, wherein the stator assembly is provided along the exterior surface of the bearing shaft and the rotor is rotatably supported by the interior bearing surface of the bearing shaft, wherein the bearing shaft provides only a single bearing of a non-ball bearing type for the rotor,

wherein the interior bearing surface is configured as a sleeve bearing along an exterior surface of the rotor to facilitate rotation of the rotor,

wherein the bearing-housing structure includes an annular disk having an outer edge that substantially aligns with or extends radially beyond an outer edge of the impeller to provide a shielding function, and

wherein the annular disk is integrally formed in one-piece with the bearing shaft.

2. The blower according to claim 1 , wherein the blower is configured to provide pressurized air up to a maximum of approximately 8 cm H 2 O.

3. The blower according to claim 1 , wherein the blower is configured to operate at a speed of approximately 15,000 rpm.

4. The blower according to claim 1 , wherein the housing includes a top cover providing the inlet and a bottom cover providing the outlet.

5. The blower according to claim 4 , wherein the bottom cover includes a plurality of stator vanes to direct airflow.

6. The blower according to claim 1 , wherein the bearing-housing structure is constructed of a low friction lubricious material.

7. The blower according to claim 6 , wherein the bearing-housing structure is constructed of sintered bronze or a polyamide-imide resin.

8. The blower according to claim 1 , wherein the motor includes a magnet and a rotor cap, the rotor cap including an interior surface that supports the magnet and an exterior surface that supports the impeller, and wherein the rotor cap is engaged with the rotor such that the stator assembly acts on the magnet to cause spinning movement of the rotor cap and hence the impeller in use.

9. The blower according to claim 1 , wherein the motor is at least partially nested within the impeller.

10. The blower according to claim 1 , wherein the impeller is retained on the rotor by magnetic retention.

11. The blower according to claim 1 , wherein the impeller is not directly fastened to the rotor.

12. The blower according to claim 11 , wherein the impeller is supported on the rotor by a rotor cap.

13. The blower according to claim 1 , wherein the annular disk is coupled to stator vanes provided between the annular disk and a bottom cover of the housing.

14. The blower according to claim 1 , wherein the bearing shaft includes a radial bearing portion and a thrust bearing portion.

15. The blower according claim 1 , wherein the rotor is directly engaged with the interior bearing surface of the bearing shaft.

16. The blower according to claim 1 , wherein the bearing-housing structure is constructed of or coated with a low friction material.

17. A PAP device comprising the blower according to claim 1 .

18. A PAP system comprising: the PAP device according to claim 17 ; a patient interface including a sealing arrangement configured to form a seal with a patient's face; and air delivery tubing to interconnect the patient interface and the PAP device.